/*
 * Copyright (c) 2012, The Caffeine-hx project contributors
 * Original author : Russell Weir
 * Contributors:
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE CAFFEINE-HX PROJECT CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE CAFFEINE-HX PROJECT CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

package chx.crypt.mode;

import chx.io.BytesOutput;
import chx.io.Output;

/**
 * Counter mode - a 1 byte block streaming mode. This version updates the
 * counter each time the number of bytes crypted matches the cipher block size
 **/
class CTR extends CTR8, implements chx.crypt.IMode {

	public function new() {
		super();
		num = 0;
		ctr_inc = 1;
	}

	override public function toString() {
		return "ctr";
	}

	override function setCipher(v:IBlockCipher) {
		super.setCipher(v);
		if(v != null)
			ctr_inc = v.blockSize;
		return v;
	}

	#if CAFFEINE_DEBUG
	/**
	 * Only for testing purposes to make sure that NIST vectors match
	 **/
	override function getBlockSize() : Int {
		return ctr_inc;
	}
	#end
}
